Verbseoul.
하다 verb

관찰하다 conjugation (gwanchalhada, to observe)

To say to observe politely in the present tense, use 관찰해요 (gwahn-chahl-hae-yoh) · gwanchalhaeyo. Below is the full conjugation of 관찰하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
관찰해
gwahn-chahl-hae
gwanchalhae
관찰해요
gwahn-chahl-hae-yoh
gwanchalhaeyo
관찰합니다
gwahn-chahl-hahm-nee-dah
gwanchalhamnida
Past
관찰했어
gwahn-chahl-hae-ssuh
gwanchalhaesseo
관찰했어요
gwahn-chahl-hae-ssuh-yoh
gwanchalhaesseoyo
관찰했습니다
gwahn-chahl-hae-sseum-nee-dah
gwanchalhaesseumnida
Future
관찰할 거야
gwahn-chahl-hahl guh-yah
gwanchalhal geoya
관찰할 거예요
gwahn-chahl-hahl guh-yae-yoh
gwanchalhal geoyeyo
관찰할 겁니다
gwahn-chahl-hahl guhm-nee-dah
gwanchalhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
관찰하세요
gwahn-chahl-hah-sae-yoh
gwanchalhaseyo
Suggestion / Let's Polite (요)
관찰해요
gwahn-chahl-hae-yoh
gwanchalhaeyo
Question Polite (요)
관찰해요?
gwahn-chahl-hae-yoh-?
gwanchalhaeyo?
Connective "and" — (고)
관찰하고
gwahn-chahl-hah-goh
gwanchalhago
Conditional "if" — (면)
관찰하면
gwahn-chahl-hah-myuhn
gwanchalhamyeon
Progressive (고 있어요)
관찰하고 있어요
gwahn-chahl-hah-goh ee-ssuh-yoh
gwanchalhago isseoyo
Want to (고 싶어요)
관찰하고 싶어요
gwahn-chahl-hah-goh shee-puh-yoh
gwanchalhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
관찰할 수 있어요
gwahn-chahl-hahl soo ee-ssuh-yoh
gwanchalhal su isseoyo
Because / So (아/어서)
관찰해서
gwahn-chahl-hae-suh
gwanchalhaeseo
Noun form — (기)
관찰하기
gwahn-chahl-hah-gee
gwanchalhagi
Noun form — (음)
관찰함
gwahn-chahl-hahm
gwanchalham